wwb is right on. To many folks,, when they see a modification,, they wonder,, "What else has been fooled with?" A professional action job,, vs a home butcher,, eer,, home gunsmith. Any work you have done by a professional,, keep the reciept documentation with it to help quell any fears of a bad job.
That said,,, I've bought a PAIR of New Vaqueros,,, stainless,, boxes & papers,, 250 rounds of factory ammo,,,a buskadero double holster rig, & with full action jobs that are the slickest a guy could ask for. I gave $650 for all of that last April,,, BECAUSE no one wanted to "take a chance" on the modifid guns,,,!
I've gotten a LOT more careful about any purchases of any used guns because of how much "home gunsmithing" and other mods I've seen advertised on the net.
At USPSA matches,, it's common to see a "race gun" or a "limited" gun used for sale at very cheap prices. Why? Because all shooters wonder how good/bad the gun is because it's used & almost all of them have been "modified." Basically a lot of guns sell cheap because of modifications.
But,, it is your gun,, and you can do as you see fit for your preferrences.